Composition roof covering



July 30, 1935. s OLSEN 2,009,811

COMPOSITION ROOF COVERING Filed March 17, 1933 ATTORNEY.

4 INVENTOR.

Patented July 3o, 1935 UNITED STATES COMPOSITION ROOF COVERING Sigurd Olsen, Forest Park, Ill.

Application March 17,

1 Claim.

This invention relates to improvements in a waterproof, substantially iireproof composition which may be used as a roof covering, slab or shingle, and when heated may be applied in mastic form to roofs, tanks, pipes or the like in order to make the same weather proof or waterproof. More specifically the composition comprises a mixture of mica, as a filler and asphalt, as a binder'.

The utility, objects and advantages of my invention willbe apparent from the accompanying drawing andollowing detail description.

In the drawing, Fig. 1 is a face view of a roofing shingle which may be constructed of the composition comprising my invention.

Fig. 2 is a side elevational view of the shingle shown in Fig. l. v

Fig. 3 is a sectional view taken on line 3-3 of Fig. 1.

Fig. 4 is a fragmentary, longitudinal cross-section of a modified form of shingle having a fibrous backing sheet.

Fig. 5 is a fragmentary sectional view of a roofing sheet constructed of the composition comprising my invention and having a fibrous backing sheet.

Referring in detail to the drawing, I indicates a shingle constructed of the composition com- 'prising the concepts of my invention. The shingle I may be of conventional shape and general outward appearance and, for purposes of illustration, is shown as being of tapered construction, having a butt end 2 and tapered thin end 3. The butt end, of course, being exposed to the weather, may be coated with a layer of asphalt in which slate granules of desired size and color may be embedded.

As a feature of my invention, the body of shingle I may be made of a mixture of mica, as a filler and asphalt as a binder, the mica. being in ake form. A shingle of this character, containing no vegetable or animal fibres which when saturated burn readily, is extremely re resistant. The shingle, roofing element or sheet constructed of mica and asphalt, unlike conventional types of roong materials which contain light saturating oils that eventually evaporate leaving a dry sheet exposed to the elements, will not dry out, crack or cause a leaky roof. In addition, the shingle is water proof, lasting, economically manufactured, exible and strong, light in Weight; will not expand or contract unduly and may be applied to the roof in any of the manners of application of conventional rooflng shingles, slabs or sheets.

1933, serial No. 661,346

(c1. 10s-s) In'manufacturing the roof covering, for instance, the shingle I, mica flakes may be thoroughly mixed with heated asphalt, the mixture having the consistency of dough. This doughlike mass of coated mica flakes may be formed 5 in a sheet and the same may be subjected to pressure between squeeze rolls, or the like, whereby excess asphalt may be removed, leaving a relatively thin film of asphalt covering each ake. The pressure of the squeeze rolls and the temperature of the asphalt during the squeezing operation may-be so controlled as to bring the4 proportion of mica to asphalt of from 30 to 50 percent mica to, respectively, to 50 percent asphalt, by weight. Of course, the relative specific weights of the constituents are such that, by volume, the mica predominates. By subjecting the sheet to pressure, the mica iiakes will substantially all be disposed in planes parallel to each other and parallel to the surface of the sheet, as shown at 4 in Figs. 3, 4 and 5, the individual mica akes being adhesively unitedto each other by the films of asphalt which coat each flake.

After the squeezing` operation, the sheet may be cooled, in-anysuitable manner familiar to those skilled in the art. 'Ihe sheet or portions thereof may then be coated with asphalt, as shown at 5 in Figs. 3, 4 and 5, and a layer of granules 6, composed of slate or the like, may be embedded in the asphalt coating 5. The sheet may then be cut into individual shingles, as shown in Figs. 1, 2 and 3, or, if desired, slabs of multi-butt elements may be cut therefrom.

Referring particularly to Fig. 4, a slight modification of my invention is shown, the reference numeral I indicating a shingle element comprising the same composition as shingle I with the addition of an adhesively united saturated felt' backing sheet 'I upon the rear face of the shingle. Sheet I may be adhesively united'to the rear face of the shingle I, by the asphalt that remains on the outside surfaces of the outermost mica flakes that make up the body portion of the roofing element. The exposed surface of backing sheet 'I on shingle I' may be covered with finely vdivided mica to prevent sticking together of the shingles while in bundles.

The roof covering, if desired, may be constructedlin the form shown in Fig. 5 wherein I" indicates a portion of a continuous sheet of roofing.` In this form of my invention the body of the sheet may be backed by a saturated fibrous sheet 8 similar, and adhesively united in a similar manner to sheet 1.

waterproof characteristics of the roof covering as a whole are not decreased.

The composition comprising my invention, instead of being used in sheet, slab or shingle form as hereinbefore described, may be used in mastic form, the mastic composition being utilized as a waterproof, weatherproof coating or layer which hardens when cooled. The ratio of mica to asphalt used may be similar to that described in connection with shingles or sheet I, I' and I", or the ratio may be changed to meet the conditions of use of the product.

It has heretofore been deemed impractical to use asphalt, having a melting point above 220 F., for roof coverings, slabs, shingles or the like, because of its brittleness. In making roofing elements of the composition comprising my invention, an asphalt of much higher melting point may be used, for instance, an asphalt having a melting point materially over 220 F., may be used as well or even better than those oi the usual range. The brittleness of the higher melting point asphalts do not impart undue brittleness to the composition because the asphalt is present in relatively thin films which coat relatively thicker, strong,` flexible mica nakes. In other words, the volume of the composition sheet, slab or shingle is predominantly mica and the resulting physical characteristics of the composition partake principally of the mica, the asphalt characteristics not exhibiting themselves to any marked degree with respect to brittleness because of the thinness of the lms.

I claim as my invention:

A composition shingle comprising a mica filler and an asphalt binder, characterized in that the mica is in flake form and constitutes the major portion of the volume of the shingle and the asphalt has a melting point of approximately 220 or above.

SIGURD OLSEN. 

